Straight clip.
These planchets are punched from the sheared or sawed end or edge of the coin metal strip.
A straight clip is thought to result when a blanking die (punch) slices through the leading or trailing end of the coin metal strip. This pre-supposes that the ends were trimmed prior to the coil being fed into the blanking press.

Another possibility is the blanking die slicing through one side of a strip that is too narrow. This situation might arise if the splitter, which divides the original wide strip into narrower slips, is not positioned right in the middle of the coil.

A small percentage of straight clips mark the termination of a planchet taper. This may be where the rollers squeezed the leading or trailing end of the strip down to an abnormally thin guage.

The edge texture of a straight clip is highly variable. It can be smooth, rough, irregular, or serrated in some fashion. This probably reflects a variety of machines employed for the task -- shears, saws, guillotines are three possibilities.

A straight clip appears on a coin as a straight edge. Not all straight edges are straight clips, however. They are sometimes confused with chain strikes, broken planchet and broken coin errors, and various forms of pre-strike damage.(More infos: http://error-ref.com/_Straight_clips_.html)

The below image illustrates metal flow and the taper and fadeout of the design rim. This is what we would expect to see when dealing with authentic straight clips.